Move style related actions to templates

js/template/LinkTemplate.js

@@ -0,0 +1,21 @@
+import html from "./html"
+import Template from "./Template"
+
+/**
+ * @typedef {import("../graph/GraphLink").default} GraphLink
+ */
+export default class LinkTemplate extends Template {
+
+    /**
+     * Computes the html content of the target element.
+     * @param {GraphLink} link Link connecting two graph nodes 
+     * @returns The result html 
+     */
+    render(link) {
+        return html`
+            <svg viewBox="0 0 100 100">
+                <line x1="0" y1="80" x2="100" y2="20" stroke="black" />
+            </svg>
+        `
+    }
+}